F125AA2AC1AD1AG1AH3AK1 UNIT EQUIPPED FOR PROPANE GASALUMINIZED STEEL HEAT EXCHANGERALUMINIZED STEEL BURNERSINGLE-STAGE VALVE (HEATING ONLY)SPARK-IGNITED, INTERMITTENT SAFETY PILOT WITH ELECTRONIC FLAME SUPERVISION AND TIMED LOCKOUT (REQUIR 115/1/60 SUPPLY VOLTAGEREZNOR